Three Step

The Three step strategy adds a loosening step between the first step and the final step, to overcome short-term relaxation effects due to embedment, and reduce preload scatter. This is sometimes used to condition the joint. This can be useful in, for example, joints with many adjoining surfaces and will have a greater effect on new parts than on reused ones, due to the smoothing of surfaces, which reduces embedment.

Conditioning the joint is done by tightening the first step to a given torque, First torque, and then releasing the load by turning the nut a specified Conditioning angle and then re-tightening the nut to its Target torque.

The table below lists all the parameters for the Three step tightening strategy. Some parameters are mandatory, some are optional and some are conditional.

The conditional parameters are not shown in the configuration menu if the condition is not valid, this is also the case when certain functions are disabled.

The table below is valid for Final target = Torque.

When the First target is reached and the conditioning step is entered, the tool makes an immediate stop and reverse before it continues with the final step. This conditioning step may need to be fine-tuned to improve ergonomics for hand-held tools.

Parameters for a torque value as the final target.

Parameters for Three-step tightening with Final target = torque.
Parameter name	Condition	Description	Default value
Target		Torque or Angle can be selected from a shortcut menu
First torque	Target = torque
First speed		Selected by radio buttons. First speed can be Automatically or Manually selected
First speed	First speed = manual	Specifies the tools speed during the first step
Conditioning angle	Strategy = Three step	Angle to turn the socket backwards during the conditioning step	180°
Conditioning speed	Strategy = Three step	Target speed for the backwards rotation during the conditioning step	345 rpm
Target speed		Selected by radio buttons. Target speed can be Automatically or Manually selected
Target speed	Target speed = manual	Specifies the tools speed during the final step
Target Torque		Defines the target torque of the final step of the tightening
Torque limits		Selected by radio buttons. Torque values for max and min can be Automatically or Manually selected
Torque min	Torque limits = Manual	Torque value for the lower limit	95% of target torque
Torque max	Torque limits = Manual	Torque value for the upper limit	120% of target torque
Angle limits		Angle limits is activated through shortcut menu. Off: No angle limit monitoring. From rundown complete: The monitoring window is set from when the Rundown complete torque is reached. From first torque: The monitoring window is set from when the First torque is reached. From torque: The monitoring window is set from when the specific torque value is reached.
Final angle monitoring torque	Angle limits = from torque	Torque value from when the angle limits are monitored
Angle min	Angle limits = on	Angle value lower limit	324°
Angle max	Angle limits = on	Angle value upper limit	396°
Time min	Angle limits = on	Minimum time for the step Range 0 - 99999 ms	0 ms
Time max	Angle limits = on	Maximum time for the step Range 1 - 99999 ms	1000 ms
Measure torque at		Selected from a shortcut menu: Max torque value: Measures the highest torque value during the tightening. Value at peak angle: Measures the torque value at the highest angle value. Shutoff: Measures the torque value before starting the stop step.
Torque compensation		Selected from a shortcut menu: On: Compensating the final torque value with the measured torque during rundown at the torque compensation point. Off: No torque compensation value is applied.	Off
Torque compensation point	Torque compensation = On	The torque compensation point is set by referring back to a specified angle from Rundown complete.	45°
Measure angle to	Angle limits = on Or final target = angle	Selected from a shortcut menu: Value at peak torque: Measures the angle value at the maximum torque during the tightening. Max angle value: Measures the maximum angle value during the tightening. Shutoff:Measures the angle value before starting the stop step.
Premature torque loss detection time			200 ms
Current monitoring		Selected from a shortcut menu: On: The current monitoring is enabled. Off: The current monitoring is disabled. The current monitor is used as a redundancy check for the measured torque to give reasonable confidence that torque readings are accurate.
Shutoff current high limit.	Current monitor = On	The current value must be above 0 and below tool maximum current.
Shutoff current low limit.	Current monitor = On	The current value must be above 0 and below the current high limit.

The table below lists all the parameters for the Three step tightening strategy. Some parameters are mandatory, some are optional and some are conditional.

The conditional parameters are not shown in the configuration menu if the condition is not valid, this is also the case when certain functions are disabled.

Parameters for a torque value as the final target.

Parameters for Three-step tightening with Final target = angle.
Parameter name	Condition	Description	Default value
Target		Torque or Angle can be selected from a shortcut menu
First torque	Target = angle
First speed		Selected by radio buttons. First speed can be Automatically or Manually selected
First speed	First speed = manual	Specifies the tools speed during the first step
Conditioning angle	Strategy = Three step	Angle to turn the socket in reverse during the conditioning step	180°
Conditioning speed	Strategy = Three step	Target speed for the reverse rotation during the conditioning step	345 rpm
Target speed		Selected by radio buttons. Target speed can be Automatically or Manually selected
Target speed	Target speed = manual	Specifies the tools speed during the final step
Torque min		Torque value for the lower limit	95% of target torque
Torque max		Torque value for the upper limit	120% of target torque
Target angle		Target value for the final step
Angle limits		Angle limits is activated through shortcut menu. Auto: Set automatically by the algorithm. Manual: The limits are set manually.
Angle min	Angle limits = Manual	Angle value lower limit	324°
Angle max	Angle limits = Manual	Angle value upper limit	396°
Time min	Angle limits = Manual	Minimum time for the step Range 0 - 99999 ms	0 ms
Time max	Angle limits = Manual	Maximum time for the step Range 1 - 99999 ms	1000 ms
Measure torque at		Selected from a shortcut menu: Max torque value: Measures the highest torque value during the tightening. Value at peak angle: Measures the torque value at the highest angle value. Shutoff: Measures the torque value before starting the stop step.
Torque compensation		Selected from a shortcut menu: On: Compensating the final torque value with the measured torque during rundown at the torque compensation point. Off: No torque compensation value is applied.	Off
Torque compensation point	Torque compensation = On	The torque compensation point is set by referring back to a specified angle from Rundown complete.	45°
Premature torque loss detection time			200 ms
Current monitoring		Selected from a shortcut menu: On: The current monitoring is enabled. Off: The current monitoring is disabled. The current monitor is used as a redundancy check for the measured torque to give reasonable confidence that torque readings are accurate.
Shutoff current high limit.	Current monitor = On	The current value must be above 0 and below tool maximum current.
Shutoff current low limit.	Current monitor = On	The current value must be above 0 and below the current high limit.